CN109580207B

CN109580207B - Downhole packer performance test method and device

Info

Publication number: CN109580207B
Application number: CN201811626165.4A
Authority: CN
Inventors: 魏宁; 李小春; 胡元武; 刘胜男
Original assignee: Wuhan Institute of Rock and Soil Mechanics of CAS
Current assignee: Wuhan Institute of Rock and Soil Mechanics of CAS
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2020-02-18
Anticipated expiration: 2038-12-28
Also published as: CN109580207A

Abstract

The invention discloses a method and a device for testing the performance of a special downhole packer, which comprises the following steps: A. starting a low-pressure air driving air system; B. starting a computer automatic control system; C. starting a computer automatic control system; D. starting an experimental process monitoring system; E. starter saltWater mixed liquid and CO₂A pressurized system; F. setting a packer; G. keeping the pressure and the temperature in the experimental container system constant, and collecting data such as the temperature, the pressure, the stress and the like in the experimental process; K. and (5) pulling out the packer, and connecting all pipelines with clean water to flush all pump valve parts. The device consists of salt water mixed liquid and CO₂The system comprises a pressurizing system, an experimental container system, a circulating heating system, a low-pressure driving air system, a computer automatic control system and an experimental process monitoring system. The method is easy to implement and simple and convenient to operate, and is used for CO₂And testing the long-term operation reliability of the underground equipment in the special geological environment of geological sequestration.

Description

Downhole packer performance test method and device

Technical Field

The invention belongs to CO₂The technical field of geological sequestration, in particular to a special downhole packer performance test method applied to CO2 geological sequestration, and also relates to a downhole packer performance test device which is used for testing the long-term reliability of downhole equipment in a CO2 geological sequestration special geological environment.

Background

Along with domestic CO₂Advances in geological sequestration research, CO₂In the geological sealing process, a CO2 injection well and a risk monitoring well need to be sealed by underground packers, and CO sealed in the stratum₂The mixture formed with underground water has strong corrosivity, and the higher temperature environment and CO in the deep stratum₂The leakage can not occur after the geological sealing, and the packer is required to be resistant to high temperature and high pressure and supercritical CO on the basis of simple structure and flexible use₂And long-term corrosion of groundwater mixtures, it is desirable to have higher performance, more reliability, and longer service life. Therefore, there is a need to develop a method for CO₂Geological sealing, etc. and performing performance test on the packer.

At present, the research on underground equipment at home and abroad is mainly focused on the field of oil field application, the test equipment is also focused on the conventional application aspect of the oil field, the research on the temperature resistance and pressure resistance of a packer rubber cylinder and the simulation test research on the contact stress of the rubber cylinder to a sleeve are mainly focused on, and the corrosion resistance research of the packer is only focused on the common corrosion resistance researchAnd (3) researching light acid corrosion resistance of the oil well. The research work above is directed at the research of the performance of the conventional packer such as the working mechanics and the like, and the research works are related to the oil field, the terrestrial heat and the CO₂The work performance of the downhole equipment after the sealing seat of the packer used in the complex environment of deep ground engineering such as geological sealing and the like is different from the work performance research of the packer. No domestic organization is aimed at CO₂The device is used for testing the working performance of the packer and other underground equipment under the multiphase fluid environment encountered in the geological sealing and other processes; in order to fill the gap, realize the comprehensive performance test and the optimized structure design of the packer working under the specific environment, and develop better CO₂A special downhole packer applied to geological sealing and other special fields needs to be developed, and a device and a method for testing the performance of the special downhole packer and downhole equipment need to be developed.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a special downhole packer performance test method which is easy to implement and simple and convenient to operate, and the work of a valve and each part can be remotely controlled through an integrated platform.

The invention also aims to provide a packer and a downhole equipment performance test and deep-ground environment test device for CO₂And testing the long-term operation reliability of the underground equipment in special geological environments such as geological sealing, oil and gas exploitation, energy underground storage, deep exploitation, deep engineering and the like. Through the mixing of different media, the actual conditions of different complex fluids on the upper and lower sections of the casing pipe after the packer seat is sealed are truly reproduced, and the accurate simulation of the complex formation conditions is realized by adding the accurate control of pressure and temperature. The high-precision control of deep environment (such as temperature, pressure, fluid components, pH value and the like) can be realized, and long-term high reliability and durability tests can be realized; meanwhile, the sampling can be realized under the conditions of not disturbing the fluid components in the sleeve and testing.

In order to achieve the purpose, the invention adopts the following technical measures:

the technical conception of the invention is as follows: the method and the device for testing the performance of the underground packer in the complex environment are provided by regulating the temperature, the pressure, the pH value, a medium contacted with the equipment and the like in the experimental device, and carrying out pressurization, pressure stabilization, pressure relief and strengthening experiments on the equipment in the experimental device to test the stress, the strain magnitude, the distribution rule, the corrosion resistance and the high temperature resistance of the surface characteristic point of the equipment under different environments and different external loads and the long-term working stability.

An environmental downhole equipment performance test method (taking an experiment method related to a downhole special packer system as an example) comprises the following steps:

1. installing a rubber sleeve stress detection device at the position of a rubber sleeve of the packer; the packer is connected with a packer plug and a central pipe joint in a downward mode and is arranged in an experimental container in a downward mode; the upper part and the lower part of the experimental container are respectively connected with a container upper joint and a container lower joint; the saline mixed liquid and CO are introduced into the pressurizing hole of the central pipe of the container₂A central pipe interface pipeline of a packer in a pressurizing system; the annular pressurizing hole at the lower part of the container is connected with the saline mixed liquid and CO₂A lower annulus interface line in the pressurized system; the upper annular pressurizing hole of the container is connected with the mixed solution of salt water and CO₂An upper annulus interface line in the pressurized system; connecting a circulating air inlet in the experimental container with a circulating air shackle through a pipeline, and connecting a circulating air outlet with a circulating air inlet ball valve; and a lower annular signal acquisition system is installed at a corresponding position of the container lower annular signal acquisition access hole, and an upper annular signal acquisition system is installed at a corresponding position of the container upper annular signal access hole.

2. Starting a low-pressure air-driven air system: starting an air compressor, pressurizing air and storing the air into an air storage tank, and compressing the air in the air storage tank to the pressure of 1 MPa; then opening a control ball valve of a driving air communication system, and introducing low-pressure air into the saline water mixed liquor and CO₂The low-pressure air interface pipeline of the pressurization system is a saline water mixed liquid and CO₂Each pneumatic control valve in the pressurized system provides drive air.

3. The computer automatic control system is started, and the system has the main function of integrating all collected signals in the system to remotely control the starting and stopping of various devices and the opening and closing of the pump valve through computer feedback control.

4. The experimental process monitoring system is started, and the system has the main functions of monitoring and recording the running conditions of various devices and pipelines in the experimental process, and observing the emergency situations and the like generated in the experimental engineering at the first time.

5. Maintaining brine mixture and CO₂Other valves in the pressurization system are closed, a saline mixed liquid output control ball valve is opened, a saline mixed liquid pressurization pump is started, a saline mixed liquid connection pneumatic control valve is opened, the saline mixed liquid enters a saline mixed liquid mass flowmeter after being filtered by a saline mixed liquid filter, a packer central pipe pressurization pneumatic control valve is opened, and the saline mixed liquid enters a packer central pipe after passing through a packer central pipeline pressure gauge; controlling a saline water mixed solution pressure pump, slowly pressurizing to a pressure value (less than or equal to 45MPa) required by an experiment by taking a set value (such as 2MPa) as a step length, and setting a packer; testing the stress change of the characteristic points on the surface of the rubber sleeve in the process by using a packer stress detection device;

6. closing the pressurization pneumatic control valve of the central pipe of the packer and keeping the pressure of the central pipe of the packer constant; opening a lower annulus pressurization pneumatic control valve, injecting the saline mixed liquor into the lower annulus space in the container, controlling a saline mixed liquor pressurization pump, slowly pressurizing by taking a set value (such as 2MPa) as a step length, stopping pressurizing after the quality of the saline mixed liquor reaches the required amount of the experiment, and closing a lower annulus pressurization pneumatic valve control device and the saline mixed liquor linkage pneumatic control valve; opening of CO₂Output control ball valve, start CO₂Special booster pump, start CO₂Connecting the pneumatic control valve, CO₂By CO₂After the filter enters CO₂Mass flowmeter, open the lower annular pressure pneumatic valve control device, control CO₂A special pressurizing pump, which takes a set value (such as 2MPa) as a step length and slowly pressurizes the pressure to a value about 1MPa lower than the pressure value required by the experiment; closed lower annulus pressurized pneumatic valve control device, CO₂Connecting pneumatic control valve and starting CO₂Metering pump, opening CO₂Pneumatic control valve for communicating pipe of metering pump to control CO₂The metering pump slowly and accurately pressurizes the pipeline to a pressure value required by an experiment(less than or equal to 45MPa), then opening a lower annular pressurizing pneumatic valve control device to control CO₂Pressurizing the lower annular space of the packer to a pressure value required by an experiment by using a metering pump, keeping the pressure constant for 5-10min, and acquiring stress change and data of a rubber sleeve surface characteristic point in the process by using a signal acquisition system; after completion, the lower annular space is closed, the pneumatic valve control device and CO are pressurized₂The metering pump is communicated with the pneumatic control valve through a pipeline, the lower annulus pressure relief pneumatic control valve is opened, the lower annulus pressure is slowly relieved, the experimental waste liquid enters the waste liquid recovery tank, and the lower annulus pressure relief pneumatic control valve is closed after pressure relief is finished;

7. keeping the pressure of the central pipe of the packer constant; opening a saline mixed liquid output control ball valve, starting a saline mixed liquid pressure pump, opening the saline mixed liquid connection pneumatic control valve and an upper annular pressurization pneumatic control valve, injecting the saline mixed liquid into an upper annular space of a container, controlling the saline mixed liquid pressure pump, slowly pressurizing by taking a set value (such as 2MPa) as a step length, stopping pressurizing after the quality of the saline mixed liquid reaches an experiment required amount, and closing the upper annular pressurization pneumatic control valve and the saline mixed liquid connection pneumatic control valve; opening of CO₂Output control ball valve, start CO₂Special booster pump, turning on CO₂Connecting the pneumatic control valve, CO₂By CO₂After the filter enters CO₂Mass flow meter, open the upper annular pressurized pneumatic control valve, control CO₂A special pressurizing pump, which takes a set value (such as 2MPa) as a step length and slowly pressurizes the pressure value to about 1MPa lower than the pressure value required by the experiment; closing upper annulus pressurization pneumatic control valve, CO₂Connecting pneumatic control valve and starting CO₂Metering pump, opening CO₂Pneumatic control valve for communicating pipe of metering pump to control CO₂The metering pump slowly pressurizes the pipeline to a pressure value about 1MPa lower than the experimental requirement, and then the upper annular pressurization pneumatic control valve is opened to accurately control CO₂Pressurizing the upper annular space to a pressure value (less than or equal to 45MPa) required by an experiment by using the metering pump, keeping the pressure constant for 5-10min, and testing the stress data and data change of the surface characteristic points of the rubber sleeve in the process by using the signal acquisition system through the packer stress detection device; after the completion, closing the upper annular pressurization pneumatic control valve and CO₂The metering pump is communicated with the pneumatic control valve through a pipeline, the upper annulus pressure relief pneumatic control valve is opened, the upper annulus pressure is slowly discharged, the experimental waste liquid enters the waste liquid recovery tank, and the upper annulus pressure relief pneumatic control valve is closed after pressure relief is finished;

8. keeping the pressure of the central pipe of the packer constant; opening a salt water mixed liquid output control ball valve, starting a salt water mixed liquid pressure pump, opening a salt water mixed liquid connecting pneumatic control valve, opening a lower annulus pressurization pneumatic control valve, injecting the salt water mixed liquid into the lower annulus space in the container, controlling the salt water mixed liquid pressure pump, slowly pressurizing by taking a set value (such as 2MPa) as a step length, stopping pressurizing after the salt water mixed liquid is metered to a certain mass, and closing a lower annulus pressurization pneumatic valve control device; then opening an upper annular pressurization pneumatic control valve, injecting the saline mixed liquor into the upper annular space of the container, controlling a saline mixed liquor pressurization pump, slowly pressurizing by taking a set value (such as 2MPa) as a step length, stopping pressurizing after the quality of the saline mixed liquor reaches the required amount of the experiment, and closing the upper annular pressurization pneumatic control valve and the saline mixed liquor linkage pneumatic control valve; opening of CO₂Output control ball valve, start CO₂Special booster pump, turning on CO₂Connecting the pneumatic control valve, CO₂By CO₂After the filter enters CO₂Opening the lower annular pressurization pneumatic control valve and the upper annular pressurization pneumatic control valve to control CO by the mass flow meter₂A special pressurizing pump, which takes a set value (such as 2MPa) as a step length and slowly pressurizes the pressure value to about 1MPa lower than the pressure value required by the experiment; closing lower annulus pressurization pneumatic control valve and upper annulus pressurization pneumatic control valve, CO₂Connecting a pneumatic control valve; start-up of CO₂Metering pump, opening CO₂Pneumatic control valve for communicating pipe of metering pump to control CO₂The metering pump slowly pressurizes the pipeline to a pressure value about 1MPa lower than the pressure value required by the experiment, and then the lower annular pressurization pneumatic control valve and the upper annular pressurization pneumatic control valve are opened to control CO₂Pressurizing the upper annular space to a pressure value required by the experiment by using a metering pump; starting the container heating device and the circulating air compressor, keeping the low-pressure exhaust ball valve and the low-pressure air inlet ball valve closed, opening the circulating inlet ball valve, and controlling the container to be heatedThe device slowly heats the container to a temperature value required by an experiment; keeping the pressure in the container constant in the heating process; after heating is finished, keeping the pressure, the temperature and the PH value in the container constant for 7-9 hours, and testing the stress data of the surface characteristic points of the rubber sleeve once every 5 minutes by the signal acquisition system through the packer stress detection device;

9. keeping the pressure of the central pipe of the packer constant; closing the container heating device, opening a low-pressure exhaust ball valve and a low-pressure air inlet ball valve, and cooling the container by circulating air through a circulating air compressor to room temperature (20-25 ℃); after the temperature in the container is reduced to room temperature (20-25 ℃), opening the upper annulus pressure relief air control valve device and the lower annulus pressure relief air control valve, and slowly relieving the upper annulus pressure and the lower annulus pressure, wherein the upper annulus pressure and the lower annulus pressure are the same under atmospheric pressure; opening the pressure relief air control valve of the central pipe of the packer and slowly releasing the pressure of the central pipe; in the pressure relief process, a signal acquisition system is used for testing the stress data of the characteristic points on the surface of the rubber sleeve in the process once every 0.5min by using a packer stress detection device until the pressure relief is finished; and (4) enabling the experimental waste liquid to enter a waste liquid recovery box.

10. And (4) pulling out the packer, connecting all pipelines with clean water, and flushing all parts such as pump valves.

Through the technical measures: the packer is subjected to pressurization, pressure stabilization, pressure relief and strengthening experiments to test the stress, strain magnitude, distribution rule and corrosion resistance and high temperature resistance of the surface characteristic points of the packer under different environments and different external loads. A more accurate experimental environment is provided for the experiment through the control of the high-precision metering pump; meanwhile, the long-term stability and reliability of the engineering can be predicted by further strengthening the load and providing a more severe experimental environment.

A performance tester for underground equipment is composed of the mixture of saline and CO₂A pressurized system; an experimental container system; a circulation heating system; a low pressure drive air system; a computer automatic control system; and (4) an experimental process monitoring system. The connection relation is as follows: in a brine mixture and CO₂The packer central pipe pressurized pneumatic control valve device and the lower annular pressurized pneumatic control valve device in the pressurization system are respectively connected withThe experimental container devices in the experimental container system are connected with each other, and the salt water mixed liquid and CO are₂A packer central pipe pressure relief air control valve device in the pressurization system is connected with a ball valve in the low-pressure driving air system, and an experiment container device in the experiment container system is respectively connected with a circulating air inlet ball valve and a circulating air compressor in the circulating heating system.

Brine mixed liquor and CO₂Pressurized system it is made of CO₂Gas cylinder, CO₂Output control ball valve, CO₂Special booster pump, CO₂Filter, CO₂Linkage pneumatic control valve, CO₂The device comprises a mass flow meter, a packer central pipe pressurization pneumatic control valve, a brine mixed liquid medium box, a brine mixed liquid output control ball valve, a brine mixed liquid pressurization pump, a brine mixed liquid filter, a brine mixed liquid linkage pneumatic control valve, a brine mixed liquid mass flow meter, a lower annulus pressurization pneumatic control valve, a lower annulus pipeline pressure gauge, a lower annulus pipeline safety valve, a brine mixed liquid metering pump, a CO central pipe pressurization pneumatic control valve, a packer central pipe pressurization pneumatic control valve, a brine mixed liquid medium₂Metering pump communicating pipe pneumatic control valve and CO₂Metering pump, CO₂The measuring pump communicating pipe way pneumatic control valve, upper portion annular space pressurization pneumatic control valve, upper portion annular space pipeline manometer, upper portion annular space pipeline relief valve, upper portion annular space pressure relief pneumatic control valve, lower part annular space pressure relief pneumatic control valve, packer center line manometer, packer center tube pressure relief pneumatic control valve, waste liquid recovery case unloading control ball valve constitute, and its connected relation is: the low-pressure driving air interface is connected with a driving system interface in a low-pressure driving air system; the upper annular interface is connected with the experimental container device and the upper annular pressurizing hole; the lower annular interface is connected with a lower annular pressurizing hole of the experimental container device; the central pipe interface of the packer is connected with a central pipe pressurizing hole of the experimental container device; CO2₂Gas cylinder connected with CO₂Output control ball valve, reconnecting CO₂A special booster pump is connected with CO in sequence₂Filter, CO₂Linked pneumatic control valve device, CO₂A mass flowmeter, a packer central pipe pressurized pneumatic control valve, a packer central pipeline pressure gauge, and finally connected to the joint of the packer central pipe(ii) a The brine mixed liquid medium tank is connected with the brine mixed liquid output control ball valve and then is connected with the brine mixed liquid booster pump, and then is sequentially connected with the brine mixed liquid filter, the brine mixed liquid linkage pneumatic control valve, the brine mixed liquid mass flowmeter, the lower annulus pneumatic control valve, the lower annulus pipeline pressure gauge and the lower annulus pipeline safety valve, and finally is connected to the lower annulus interface; the saline mixed liquid metering pump is connected with CO₂A metering pump communicating pipeline pneumatic control valve is connected to a pipeline saline mixed liquid booster pump and then sequentially connected between saline mixed liquid filters; CO2₂Metering pump, CO₂The metering pump communicating pipeline pneumatic control valve device is sequentially connected with an upper annular pressurization pneumatic control valve, an upper annular pipeline pressure gauge and an upper annular pipeline safety valve, and is finally connected with an upper annular interface; introducing CO₂The mass flow meter, the saline mixed liquid mass flow meter between the packer central pipe pressurization pneumatic control valves and the CO between the lower annular pressurization pneumatic control valves₂The metering pump is connected with a pipeline between the pneumatic control valve of the pipeline and the upper annular pressurizing pneumatic control valve; the upper annular pressurization air control valve and the upper annular pipeline pressure gauge are communicated with another pipeline and then connected with the upper annular pressure relief air control valve, and finally the pipeline is output to the waste liquid recovery tank; the lower annulus pressurization air control valve and the lower annulus pipeline pressure gauge are communicated with another pipeline and then connected with the lower annulus pressure relief air control valve, and finally the pipeline is output to the waste liquid recovery tank; another pipeline is communicated between the packer central pipe pressurization pneumatic control valve and the packer central pipeline pressure gauge and then connected to the packer central pipe pressure relief pneumatic control valve, and finally the pipeline is output to the waste liquid recycling tank; the waste liquid recovery case links to each other with waste liquid recovery case unloading control ball valve, and waste liquid recovery case connects out waste liquid recovery case unloading control ball valve. Each pneumatic control valve in the pipeline mainly comprises a high-pressure pneumatic valve, connecting driving air and a related control electromagnetic valve, wherein a control terminal of the electromagnetic valve is connected to an automatic computer control system, and the opening and closing of each pneumatic control valve device are directly controlled through the computer terminal.

The experimental container device consists of an upper annular signal acquisition system and an upper annular signal acquisition systemThe portion encircles empty sampling system, experiment container device, lower part annular space signal acquisition system, lower part annular space sampling system, the container lower clutch, lower part annular space pressurization hole, circulation air inlet, container heat preservation, container heating device, the container device, the center tube connects, the container top connection, center tube pressurization hole, upper portion annular space signal access hole, circulation gas outlet, the packer device, the packing element, packing element stress detection device, the packer end cap, lower part annular space signal access hole constitutes: the packer is mainly used for setting an experimental packer and providing an environment with high pressure, high temperature and a specific PH value for the set packer. The upper annular signal acquisition system is connected with the lower annular signal acquisition system, and the main function of the upper annular signal acquisition system is to acquire pressure, temperature and PH value signals of various positions such as pipelines and containers and transmit the signals to the signal acquisition terminal computer control system. The upper annular signal acquisition system and the lower annular signal acquisition system mainly comprise a plug-in temperature sensor with the temperature measurement range of 0-150 ℃, a high-precision pressure sensor with the special pressure measurement range of 0-50MPa, a corresponding PH value sensor, accessories thereof and the like. The connection relation is as follows: the container in the experimental container is respectively connected with a lower container joint, an upper container joint, a central pipe joint and a packer, and the packer is connected with a packer plug; the outer layer of the container is connected with the container heating and container insulating layer; the lower annular pressurizing hole is connected with the salt water mixed liquid and CO₂The lower annular interface and the upper annular pressurizing hole in the pressurizing system are connected with the saline mixed liquid and CO₂The upper annular interface and the central pipe pressurizing hole in the pressurizing system are connected with the saline mixed liquid and CO₂A packer center tube interface in a pressurized system; the upper annular signal acquisition access hole interface is accessed to the upper annular signal acquisition system; the lower annular signal acquisition access hole interface is accessed to the lower annular signal acquisition system; the circulating air inlet and the circulating air outlet are respectively connected with a circulating air compressor and a circulating air inlet ball valve. Rubber sleeve stress detection device: the method has the main functions of detecting stress data of characteristic points on the surface of the rubber cylinder in the experimental process; mainly comprises a strain type stress detection sensor and a signal transmission device. The detection signal is connected to the computer automatic control system.

The circulation heating system consists of a circulation air compressor, a low-pressure air inlet valve, a low-pressure exhaust valve and a circulation air inlet ball valve, and the connection relationship is as follows: the low-pressure air inlet valve is connected with the circulating air inlet ball valve, and the circulating air compressor is connected with the low-pressure exhaust ball valve, the low-pressure air inlet ball valve and the circulating air inlet ball valve respectively and then is connected with the circulating air inlet and the circulating air outlet in the experimental container device.

The low-pressure driving air system consists of an air compressor, an air storage tank, a safety valve, an air filter, a pressure gauge and a ball valve which are sequentially connected, and has the main function of providing clean low-pressure driving air for the whole system and realizing automatic control by opening and closing each pneumatic control valve device through controlling the circulation of the driving air by a computer. The connection relation is as follows: the air compressor is sequentially connected with the air storage tank, the safety valve, the air filter, the pressure gauge and the ball valve; and then enters the drive system interface.

Computer automatic control system: the system mainly comprises a DELL computer, a multifunctional data acquisition card, a Siemens PLC and other basic electrical elements, wherein the multifunctional data acquisition card is used for storing data, and the DELL computer, the Siemens PLC and the other basic electrical elements jointly realize the remote control of the whole system.

Experiment process monitoring system: mainly comprises an SONY spherical camera, a hard disk video recorder and a Samsung 119-inch wide-screen high-definition liquid crystal display which are connected through a special line. The connection relation is as follows: the SONY spherical cameras are reasonably distributed and installed in a room for placing experimental equipment, and are respectively connected with a hard disk video recorder and a display in a control room through special lines to jointly form an experimental process monitoring system.

Through the connection, the different media are accurately mixed, set conditions including temperature, pressure and fluid components are achieved, accurate simulation of complex formation conditions is achieved, and a foundation is provided for experiments.

Compared with the prior art, the invention has the following advantages and effects:

testing the stress, strain and distribution rule of characteristic points of downhole equipment such as a packer and the like under different external loads and different environmental actions by injecting a specific medium into an experimental device, pressurizing, stabilizing and releasing pressure and changing various water quality conditions such as temperature, pH value, mineralization and the like in a container; (2) testing the corrosion resistance, high temperature resistance and long-term change rule of downhole equipment such as a packer and the like in a characteristic environment; (3) the invention can simulate various complex stratum environments, has high realization precision, can meet the requirements of high-precision experiments, and has safe and reliable work and good long-term stability.

Drawings

FIG. 1 is a schematic structural diagram of a downhole packer performance testing apparatus.

FIG. 2 is a schematic diagram of an experimental container device in a downhole packer performance testing device.

Fig. 3 is a pressure curve for a center tube.

Fig. 4 is a lower chamber pressure resistance curve.

FIG. 5 is a photograph of a downhole packer performance testing apparatus.

Fig. 3 is a pressure curve inside the central tube when the packer is set, and it can be seen from the graph that when the pressure is increased to about 10MPa, the pressure drop is suddenly generated, because when the pressure reaches about 10MPa, the setting shear pin of the packer is sheared, and the piston pushes the compression rubber cylinder to start the setting action. When the pressure of the central pipe reaches about 23.5MPa, the compression value of the rubber sleeve of the packer is the minimum, the slip is opened to clamp the wall of the sleeve to realize the setting of the packer, then the locking mechanism of the inner piston is locked, and the setting process is finished. The pressure is stabilized for 20 minutes, and the central pipe has no pressure drop, which indicates that the central pipe is well sealed. When the pressure of the central tube is removed, the packer is locked by a retraction mechanism of the inner piston, and the packer cannot be unsealed.

Fig. 4 is a pressure resistance experiment performed on the lower cavity of the packer after the packer is set. And pressurizing the lower cavity of the packer to 17MPa after the packer is set, and stabilizing the pressure for 15 minutes to observe the pressure drop condition. In the figure, 3 different curves reflect the experiment of repeatedly pressurizing and decompressing the lower cavity for 3 times, and the curve shows that the condition of pressure drop does not occur after the lower cavity of the packer is pressurized to 17MPa, and reflects that the sealing function and the clamping function of the slip are good after the packer is set. Through the experiment, the packer can effectively complete the actions of setting, sealing and unsealing under the designed pressure.

Wherein:

1-brine mixture and CO₂A pressurization system, a 2-experimental container system, a 3-circulation heating system and a 4-low-pressure driving air system; wherein: 1-brine mixture and CO₂In a pressurized system: 1-1-CO₂Gas cylinder (common), 1-2-CO₂Output control ball valve (common), 1-3-CO₂Special booster pump (common), 1-4-CO₂Filter (Normal), 1-5-CO₂Linked pneumatic control valve (Normal), 1-6-CO₂The system comprises a mass flow meter, a 1-7-packer central tube pressurization pneumatic control valve (common), a 1-8-saline mixed liquid medium box, a 1-9-saline mixed liquid output control ball valve (common), a 1-10-saline mixed liquid pressurization pump (common), a 1-11-saline mixed liquid filter (common), a 1-12-saline mixed liquid linkage pneumatic control valve (common), a 1-13-saline mixed liquid mass flow meter (common), a 1-14-lower annulus pressurization pneumatic control valve (common), a 1-15-lower annulus pipeline pressure gauge (common), a 1-16-lower annulus pipeline safety valve (common), a 1-17-saline mixed liquid metering pump (common), a 1-18-CO₂Metering pump communicating pipe pneumatic control valve (common), 1-19-CO₂Metering pump, 1-20-CO₂A metering pump communicating pipeline pneumatic control valve (common), a 1-21-upper annulus pressurization pneumatic control valve (common), a 1-22-upper annulus pipeline pressure gauge (common), a 1-23-upper annulus pipeline safety valve (common), a 1-24-upper annulus pressurization pneumatic control valve (common), a 1-25-lower annulus pressurization pneumatic control valve (common), a 1-26-packer central pipeline pressure gauge (common), a 1-27-packer central pipe pressurization pneumatic control valve (common), a 1-28-waste liquid recycling tank and a 1-29-waste liquid recycling tank emptying control ball valve (common); 2-laboratory vessel system: 2-1-upper annulus signal acquisition system, 2-2-upper annulus sampling system, 2-3-experimental container device, 2-4-lower annulus signal acquisition system, 2-5-lower annulus sampling system, 2-3-1-container lower joint, 2-3-2-lower annulus pressurizing hole, 2-3-3-circulating air inlet, 2-3-4-container heat-insulating layer, 2-3-5-container heating device,2-3-6-container device, 2-3-7-central pipe joint, 2-3-8-container upper joint, 2-3-9-central pipe pressurizing hole, 2-3-10-upper annular pressurizing hole, 2-3-11-upper annular signal access hole, 2-3-12-circulating air outlet, 2-3-13-packer, 2-3-14-rubber cylinder, 2-3-15-rubber cylinder stress detection device, 2-3-16-packer plug and 2-3-17-lower annular signal access hole; in the 3-circulation heating system, 3-1-circulation air compressor (common), 3-2-low pressure air inlet valve (common), 3-3-low pressure air outlet valve (common) and 3-4-circulation air inlet ball valve (common); 4-low pressure drive air system: 4-1-air compressor (type W-0.9/7), 4-2-air storage tank (common), 4-3-safety valve (common), 4-4-air drying filter (common), 4-5-low pressure air pipeline pressure gauge (common), 4-6-drive air communication system control ball valve (common).

All of the above components are commercially available.

Detailed Description

Example 1:

a downhole packer performance test method comprises the following steps:

1. installing a rubber sleeve stress detection device at the position of a rubber sleeve of the packer; the packer is connected with a packer plug and an upper central pipe joint and is put into an experimental container; the upper part and the lower part of the experimental container are respectively connected with a container upper joint and a container lower joint; the saline mixed liquid and CO are introduced into the pressurizing hole of the central pipe of the container₂A central pipe interface pipeline of a packer in a pressurizing system; the annular pressurizing hole at the lower part of the container is connected with the saline mixed liquid and CO₂A lower annulus interface line in the pressurized system; the upper annular pressurizing hole of the container is connected with the mixed solution of salt water and CO₂An upper annulus interface line in the pressurized system; connecting a circulating air inlet in the experimental container with a circulating air shackle through a pipeline, and connecting a circulating air outlet with a circulating air inlet ball valve; and a lower annular signal acquisition system is installed at a corresponding position of the container lower annular signal acquisition access hole, and an upper annular signal acquisition system is installed at a corresponding position of the container upper annular signal access hole.

2. Starting a low-pressure air-driven air system: the air compressor is started up and the air compressor is started up,pressurizing the air and storing the air into an air storage tank, and compressing the air in the air storage tank to the pressure of 1 MPa; then opening a control ball valve of a driving air communication system, and introducing low-pressure air into the saline water mixed liquor and CO₂The low-pressure air interface pipeline of the pressurization system is a saline water mixed liquid and CO₂Each pneumatic control valve in the pressurized system provides drive air.

4. The experimental process monitoring system is started, and the system has the main functions of monitoring the running conditions of various devices and pipelines in the experimental process, and observing the emergency situations and the like generated in the experimental engineering at the first time.

5. Maintaining brine mixture and CO₂Other valves in the pressurization system are closed, a saline mixed liquid output control ball valve is opened, a saline mixed liquid pressurization pump is started, a saline mixed liquid connection pneumatic control valve is opened, the saline mixed liquid enters a saline mixed liquid mass flowmeter after being filtered by a saline mixed liquid filter, a packer central pipe pressurization pneumatic control valve is opened, and the saline mixed liquid enters a packer central pipe after passing through a packer central pipeline pressure gauge; controlling a saline mixed liquid pressurizing pump, slowly pressurizing to 25MPa by taking 2MPa as a step length, and setting a packer; testing the stress data of the characteristic points on the surface of the rubber sleeve in the process by using a signal acquisition system through a packer stress detection device;

6. closing the pressurization pneumatic control valve of the central pipe of the packer and keeping the pressure of the central pipe of the packer constant; opening a lower annulus pressurization pneumatic control valve, injecting the saline mixed liquor into the lower annulus space in the container, controlling a saline mixed liquor pressurization pump, slowly pressurizing by taking 2MPa as a step length, stopping pressurizing after the saline mixed liquor is metered to a certain mass, and closing a lower annulus pressurization pneumatic valve control device and a saline mixed liquor linkage pneumatic control valve device; opening of CO₂Output control ball valve, start CO₂Special booster pump, start CO₂Connecting the pneumatic control valve, CO₂By CO₂After the filterInto CO₂Mass flow meter, opening the pressurized pneumatic valve in the lower annular space to control CO₂A special pressurizing pump which slowly pressurizes to 24MPa by taking 2MPa as a step length; closing lower annulus pressurized pneumatic valve, CO₂Connecting pneumatic control valve and starting CO₂Metering pump, opening CO₂Pneumatic control valve for communicating pipe of metering pump to control CO₂The metering pump slowly pressurizes the pipeline to 24MPa, and then the lower annular pressurizing pneumatic valve is opened to control CO₂Pressurizing the annular space at the lower part of the packer to 25MPa by a metering pump, keeping the pressure constant for 5-10min, and testing the stress data and the data change of the surface characteristic point of the packing element in the process by a signal acquisition system through a packer stress detection device; after the completion, the lower annular pressurized pneumatic valve and CO are closed₂The metering pump is communicated with the pneumatic control valve through a pipeline, the lower annulus pressure relief pneumatic control valve is opened, the lower annulus pressure is slowly relieved, the experimental waste liquid enters the waste liquid recovery tank, and the lower annulus pressure relief pneumatic control valve is closed after pressure relief is finished;

7. keeping the pressure of the central pipe of the packer constant; opening a salt water mixed liquid output control ball valve, starting a salt water mixed liquid pressure pump, opening the salt water mixed liquid connection pneumatic control valve and an upper annular pressurization pneumatic control valve, injecting the salt water mixed liquid into an upper annular space of a container, controlling the salt water mixed liquid pressure pump, slowly pressurizing by taking 2MPa as a step length, stopping pressurizing after the salt water mixed liquid is metered to a certain mass, and closing the upper annular pressurization pneumatic control valve and the salt water mixed liquid connection pneumatic control valve; opening of CO₂Output control ball valve, start CO₂Special booster pump, turning on CO₂Connecting the pneumatic control valve, CO₂By CO₂After the filter enters CO₂The mass flowmeter opens the upper annular pressurization pneumatic control valve, controls the CO2 special pressurization pump, takes 2MPa as the step length, and slowly pressurizes to about 24 MPa; closing the upper annulus pressurization air control valve, connecting the CO2 with the pneumatic control valve, starting the CO2 metering pump, opening the pneumatic control valve of a CO2 metering pump communicating pipe, controlling the CO2 metering pump to slowly pressurize the pipeline to about 24MPa, then opening the upper annulus pressurization air control valve, controlling the CO2 metering pump to pressurize the upper annulus to 25MPa, keeping the pressure constant for 5-10min, and acquiring signalsThe system tests the stress data and data change of the characteristic points on the surface of the rubber sleeve in the process through the packer stress detection device; after the pressure relief is finished, closing an upper annulus pressurization air control valve and a CO2 metering pump communicating pipeline pneumatic control valve, opening an upper annulus pressure relief air control valve, slowly discharging the upper annulus pressure, feeding the experimental waste liquid into a waste liquid recovery tank, and closing the upper annulus pressure relief air control valve after the pressure relief is finished;

8. keeping the pressure of the central pipe of the packer constant; opening a saline mixed liquid output control ball valve, starting a saline mixed liquid pressure pump, opening the saline mixed liquid and connecting a pneumatic control valve, opening a lower annulus pressurization pneumatic control valve, injecting the saline mixed liquid into the lower annulus space in the container, controlling the saline mixed liquid pressure pump, slowly pressurizing by taking 2MPa as a step length, stopping pressurizing after the quality of the saline mixed liquid reaches the required amount of the experiment, and closing the lower annulus pressurization pneumatic valve; then opening an upper annular pressurization pneumatic control valve, injecting the saline mixed liquor into the upper annular space of the container, controlling a saline mixed liquor pressurization pump, slowly pressurizing by taking 2MPa as a step length, stopping pressurizing after the quality of the saline mixed liquor reaches the required amount of the experiment, and closing the upper annular pressurization pneumatic control valve and the saline mixed liquor linkage pneumatic control valve; opening of CO₂Output control ball valve, start CO₂Special booster pump, turning on CO₂Connecting the pneumatic control valve, CO₂By CO₂After the filter enters CO₂Opening the lower annular pressurization pneumatic control valve and the upper annular pressurization pneumatic control valve to control CO by the mass flow meter₂A special pressurizing pump which slowly pressurizes to 24MPa by taking 2MPa as a step length; closing lower annulus pressurization pneumatic control valve and upper annulus pressurization pneumatic control valve, CO₂Connecting a pneumatic control valve; start-up of CO₂Metering pump, opening CO₂Pneumatic control valve for communicating pipe of metering pump to control CO₂The metering pump slowly pressurizes the pipeline to about 24MPa, and then the lower annular pressurization pneumatic control valve and the upper annular pressurization pneumatic control valve are opened to control CO₂Pressurizing the upper annular space to 25MPa by a metering pump; starting the container heating device and the circulating air compressor, keeping the low-pressure exhaust ball valve and the low-pressure air inlet ball valve closed, and opening the circulating air inletRemoving a ball valve, and controlling a container heating device to slowly heat the container to 120 ℃; keeping the pressure in the container constant in the heating process; after heating is finished, keeping the pressure in the container at 25MPa, the temperature at 120 ℃ and the pH value constant for 7-9 hours, and testing the stress data of the surface characteristic points of the rubber sleeve once every 5min by a signal acquisition system through a packer stress detection device;

9. keeping the pressure of the central pipe of the packer constant; closing the container heating device, opening a low-pressure exhaust ball valve and a low-pressure air inlet ball valve, and cooling circulating air of the container to room temperature by a circulating air compressor; after the temperature in the container is reduced to room temperature, opening the upper annular pressure relief air control valve and the lower annular pressure relief air control valve, and slowly relieving the upper annular pressure and the lower annular pressure; opening the pressure relief air control valve of the central pipe of the packer and slowly releasing the pressure of the central pipe; in the pressure relief process, a signal acquisition system is used for testing the stress data of the characteristic points on the surface of the rubber sleeve in the process once every 0.5min by using a packer stress detection device until the pressure relief is finished; and (4) enabling the experimental waste liquid to enter a waste liquid recovery box.

Through the experiments, the conditions of the complex formation environment are simulated under the accurate control of temperature, pressure, pH value, media contacted with the equipment and the like, and the equipment in the experimental device is subjected to pressurization, pressure stabilization, pressure relief and strengthening experiments to test the stress, strain magnitude and distribution rule of the surface characteristic points of the equipment under different environments and different external loads and the corrosion resistance, high temperature resistance and long-term working stability.

Example 2:

a performance test device for underground equipment comprises a saline mixed liquid and CO2 pressurization system 1, an experiment container system 2, a circulating heating system 3, a low-pressure driving air system 4, a computer automatic control system and a 5 experiment process monitoring system. The connection relation is as follows: the packer central pipe pressurization air control valves 1-7 and the lower annular pressurization air control valves 1-14 in the saline water mixed liquid and CO2 pressurization system 1 are respectively connected with the experiment containers 2-3 in the experiment container system 2, the packer central pipe pressurization air control valves 1-27 in the saline water mixed liquid and CO2 pressurization system 1 are connected with the ball valves 4-6 in the low-pressure driving air system 4, and the experiment containers 2-3 in the experiment container system 2 are respectively connected with the circulating air inlet ball valves 3-4 and the circulating air compressor 3-1 in the circulating heating system 3.

The brine mixed solution and CO₂An upper annular signal acquisition system 2-2 and a lower annular signal acquisition system 2-4 in the pressurization system 1 are respectively provided with an inserted temperature sensor (the model is EJYB-GP-T20-3 temperature sensor) with the temperature measurement range of 0-150 ℃, a special high-precision pressure sensor (the model is German WIKA) with the pressure measurement range of 0-50MPa (the pressure between 0-50MPa can be achieved), and a corresponding high-temperature high-pressure PH value sensor (the model is T85P5000 glass-based PH electrode), and signal wires are connected and connected to a signal acquisition terminal computer control system.

The experimental container device 2-3 was equipped with a Y444X 118-120/25 type packer. The strain type stress detection sensor and the signal transmission device are arranged on the surface of a packer rubber cylinder of a Y444X 118-120/25 type, and the signal wire of the strain type stress detection sensor and the signal transmission device is connected to an automatic control system of a computer.

The low-pressure air drives the air system 4: starting an air compressor 4-1, boosting air and then storing the air into an air storage tank 4-2, and compressing the air in the air storage tank to 1 MPa; then, a control ball valve 4-6 of a driving air communication system is opened, and low-pressure air enters a low-pressure air interface pipeline of the brine mixed liquor and CO2 pressurizing system 1 to obtain brine mixed liquor and CO₂Each pneumatic control valve arrangement in the pressurized system provides drive air.

The computer automatic control system has the main function of integrating all collected signals in the system and achieving remote control of starting and stopping of various devices and opening and closing of pump valves through computer feedback control.

The experimental process monitoring system is started, and the system has the main functions of monitoring the running conditions of various devices and pipelines in the experimental process, and observing the emergency situations and the like generated in the experimental engineering at the first time.

The computer automatic control system and the experimental process monitoring system adopt products mature in the current market, and can meet the use requirements of the invention.

The mixed solution of the brine and CO is maintained₂Closing all the parts in the pressurization system 1, opening a brine mixed liquid output control ball valve 1-9, starting a brine mixed liquid pressurization pump 1-10, opening the brine mixed liquid and connecting a pneumatic control valve device 1-12, filtering the brine mixed liquid through a brine mixed liquid filter 1-11 and then entering a brine mixed liquid mass flowmeter 1-13, opening a packer central pipe pressurization pneumatic control valve device 1-7, and enabling the brine mixed liquid to enter the packer central pipe after passing through a packer central pipeline pressure gauge 1-26; controlling a saline mixed solution pressure pump 1-10, slowly pressurizing to 25MPa by taking 2MPa as a step length, and setting a packer device 3-13; testing the stress data of the surface characteristic points of the rubber sleeve in the process by using a signal acquisition system through the packer stress detection device 2-3-15;

the closed central pipe pressurization pneumatic control valve devices 1-7 keep the central pipe pressure of the packer constant; opening the lower annular pressurization pneumatic control valve device 1-14, injecting the saline mixed liquor into the lower annular space in the container, controlling the saline mixed liquor pressurization pump 1-10, slowly pressurizing by taking 2MPa as a step length, stopping pressurization after the saline mixed liquor 1-13 is metered to a certain mass, and closing the lower annular pressurization pneumatic valve device 1-14 and the saline mixed liquor linkage pneumatic control valve device 1-12; opening of CO₂Output control ball valve 1-2, start CO₂1-3 special pressure pump, starting CO₂Linkage pneumatic control valve device 1-5, CO₂By CO₂After the filter drier 1-6, the CO enters₂Opening the lower annular pressure pneumatic valve control device 1-14 by the mass flow meter 1-16 to control CO₂A special pressure pump 1-3, which takes 2MPa as the step length and slowly pressurizes to about 24 MPa; closed lower annulus pressurized pneumatic valve control device 1-14, CO₂Connecting pneumatic control valve devices 1-5, starting CO₂Metering pump 1-19, opening CO₂A metering pump communicating pipeline pneumatic control valve device 1-20 for controlling CO₂The metering pump 1-19 slowly pressurizes the pipeline to about 24MPa, and then the lower annular pressurizing pneumatic valve control device 1-14 is opened to control CO₂Pressurizing the lower annular space of the packer to 25MPa by a metering pump 1-19, keeping the pressure constant for 5-10min, and sealing a signal acquisition systemThe separator stress detection device 3-15 tests the stress data and data change of the characteristic points on the surface of the rubber cylinder in the process; closing the lower annular pressurized pneumatic valve control devices 1-14 and CO after completion₂A metering pump communicating pipeline pneumatic control valve device 1-20 is opened, a lower annulus pressure relief pneumatic control valve device 1-25 is opened, the lower annulus pressure is slowly relieved, the experimental waste liquid enters a waste liquid recovery tank 1-28, and the lower annulus pressure relief pneumatic control valve device 1-25 is closed after pressure relief is completed;

the pressure of the central pipe of the packer is kept constant; opening a saline mixed liquid output control ball valve 1-9, starting a saline mixed liquid pressure pump 1-10, opening the saline mixed liquid and connecting a pneumatic control valve device 1-12 and an upper annular pressure pneumatic control valve device 1-21, injecting the saline mixed liquid into an upper annular space of a container, controlling the saline mixed liquid pressure pump 1-10, slowly pressurizing by taking 2MPa as a step length, stopping pressurizing after the saline mixed liquid 1-13 is measured to a certain mass, closing the upper annular pressure pneumatic control valve device 1-21 and connecting the saline mixed liquid and the pneumatic control valve device 1-12; opening of CO₂Output control ball valve 1-2, start CO₂Special booster pump 1-3, turn on CO₂Linkage pneumatic control valve device 1-5, CO₂By CO₂After the filter drier 1-6, the CO enters₂Opening the upper annular pressurized air control valve device 1-21 by the mass flow meter 1-16 to control CO₂A special pressure pump 1-3, which takes 2MPa as the step length and slowly pressurizes to about 24 MPa; closing upper annulus pressurized pneumatic control valve device 1-21, CO₂Connecting pneumatic control valve devices 1-5, starting CO₂Metering pump 1-19, opening CO₂A metering pump communicating pipeline pneumatic control valve device 1-20 for controlling CO₂The metering pump 1-19 slowly pressurizes the pipeline to about 24MPa, and then the upper annular pressurization pneumatic control valve device 1-21 is opened to control CO₂Pressurizing the upper annular space to 25MPa by the metering pump 1-19, keeping the pressure constant for 5-10min, and testing the stress data and data change of the surface characteristic point of the rubber sleeve in the process by the signal acquisition system through the packer stress detection device 3-15; closing the upper annulus pressurized pneumatic control valve device 1-21, CO after completion₂A metering pump communicating pipeline pneumatic control valve device 1-20 is opened to carry out pneumatic control on upper annular pressure reliefThe valve device 1-24 is used for slowly releasing the pressure of the upper annulus, the experimental waste liquid enters the waste liquid recovery box 1-28, and the upper annulus pressure relief pressure control valve device 1-24 is closed after pressure relief is finished;

the pressure of the central pipe of the packer is kept constant; opening a saline water mixed liquid output control ball valve 1-9, starting a saline water mixed liquid pressure pump 1-10, opening the saline water mixed liquid connection pneumatic control valve device 1-12, opening a lower annular pressure pneumatic control valve device 1-14, injecting the saline water mixed liquid into a lower annular space in a container, controlling the saline water mixed liquid pressure pump 1-10, slowly pressurizing by taking 2MPa as a step length, stopping pressurizing after the saline water mixed liquid 1-13 is measured to a certain mass, and closing the lower annular pressure pneumatic valve control device 1-14; then opening the upper annular pressurization air control valve device 1-21, injecting the saline water mixed liquor into the upper annular space of the container, controlling the saline water mixed liquor pressurization pump 1-10, slowly pressurizing by taking 2MPa as a step length, stopping pressurizing after the saline water mixed liquor 1-13 is metered to a certain mass, and closing the upper annular pressurization air control valve device 1-21 and the saline water mixed liquor linkage air control valve device 1-12; opening of CO₂Output control ball valve 1-2, start CO₂Special booster pump 1-3, turn on CO₂Linkage pneumatic control valve device 1-5, CO₂By CO₂After the filter drier 1-6, the CO enters₂Opening the lower annular pressurization air control valve devices 1-14 and the upper annular pressurization air control valve devices 1-21 to control CO by the mass flow meters 1-16₂A special pressure pump 1-3, which takes 2MPa as the step length and slowly pressurizes to about 24 MPa; closing lower annulus pressurization gas control valve unit 1-14 and upper annulus pressurization gas control valve unit 1-21, CO₂A pneumatic control valve device 1-5; start-up of CO₂Metering pump 1-19, opening CO₂A metering pump communicating pipeline pneumatic control valve device 1-20 for controlling CO₂The metering pump 1-19 slowly pressurizes the pipeline to 24MPa, and then the lower annular pressurization air control valve device 1-14 and the upper annular pressurization air control valve device 1-21 are opened to control CO₂The upper annular space is pressurized to 25MPa by a metering pump 1-19; starting the container heating device 2-3-5 and the circulating air compressor 3-1, keeping the low-pressure exhaust ball valve 3-3 and the low-pressure air inlet ball valve 3-2 closed, and opening the circulating inlet ball valve3-4, controlling a container heating device 2-3-5 to slowly heat the container to 120 ℃; keeping the pressure in the container constant in the heating process; after heating is finished, keeping the pressure, the temperature and the PH value in the container constant for 8 hours, and testing the stress data of the surface characteristic points of the rubber sleeve once every 5min by a signal acquisition system through a packer stress detection device 2-3-15;

the pressure of the central pipe of the packer is kept constant; closing the container heating device 2-3-5, opening the low-pressure exhaust ball valve 3-3 and the low-pressure air inlet ball valve 3-2, and cooling the container by circulating cold air through the circulating air compressor 3-1; after the temperature in the container is reduced to room temperature, opening the upper annular pressure relief air control valve devices 1-24 and the lower annular pressure relief air control valve devices 1-25, and slowly relieving the upper annular pressure and the lower annular pressure; opening the pressure relief air control valve device 1-27 of the central pipe of the packer, and slowly releasing the pressure of the central pipe; in the pressure relief process, a signal acquisition system is used for testing the stress data of the characteristic points on the surface of the rubber sleeve in the process once every 0.5min through a packer stress detection device 3-15 until the pressure relief is finished; and the experimental waste liquid enters a waste liquid recovery tank 1-28.

The experimental container device 2-3 is characterized in that as shown in figure 2, an upper annular pressurizing hole 2-3-10, a central pipe pressurizing hole 2-3-9, a container upper joint 2-3-8, a central pipe joint 2-3-7, a container device 2-3-6, a packer 2-3-13, a rubber sleeve 2-3-14 on the packer, a rubber sleeve stress detection device 2-3-15, a packer plug 2-3-16, a lower annular signal access hole 2-3-17, a lower annular pressurizing hole 2-3-2 and a container lower joint 2-3-1 sequentially form the experimental container device 2-3 from top to bottom. Experimental container device 2-3 and connecting brine mixed liquid and CO₂The lower annular interface and the upper annular pressurizing hole 2-3-10 of the pressurizing system 1 are connected with the salt water mixed liquid and CO₂The upper annular interface and the central pipe pressurizing hole 2-3-9 in the pressurizing system 1 are connected with the saline mixed liquid and CO₂A packer center tube interface in the pressurization system 1; an upper annular signal acquisition access hole 2-3-11 is connected with an upper annular signal acquisition system 2-1 through an interface; the interface of the lower annular signal acquisition access hole 2-3-17 is accessed into the lower annular signal acquisition system 2-4; the circulating air inlet 2-3-3 and the circulating air outlet 2-3-12 are respectively connected with a circulating air compressor 3-1 and circulating inlet airAnd 3-4 of ball valve.

The container device 2-3-6 is a cylinder processed by super 13cr, and the upper end and the lower end of the cylinder are respectively connected with an upper annular pressurizing hole 2-3-10, a central pipe pressurizing hole 2-3-9, a container upper joint 2-3-8, a central pipe joint 2-3-7, a lower annular signal access hole 2-3-17, a lower annular pressurizing hole 2-3-2 and a container lower joint 2-3-1 to form the container device 2-3-6 as shown in figure 2.

The container heating device 2-3-4 is shown in figure 2, and a layer of asbestos heat-insulating material is wrapped outside the experimental container device 2-3-6 to realize heat insulation of the experimental container device 2-3, so that the aim of temperature control is fulfilled.

The rubber cylinder stress detection device adopts stress sheet measurement to connect the strain gauge with an object, such as 502 glue. When the rubber cylinder is deformed by external force, the stress sheet is deformed accordingly, and the resistance value of the stress sheet is correspondingly changed. The measured resistance variation can be converted into an actual strain value through a strain gauge coefficient indicated by a strain gauge manufacturer. The detection of the stress of the rubber cylinder is realized.

The packer of the type Y444X 118-120/25 is discharged. All pipelines are connected with clean water to flush all parts such as pump valves and the like.

For experimental data, see fig. 3 and 4: FIG. 3 is a pressure curve of the central tube during the experiment, which is a curve obtained by recording and plotting the pressure value of the central tube during the experiment; fig. 4 is a pressure resistance curve of the lower chamber during the experiment, which is a curve obtained by recording and plotting the pressure value of the lower chamber during the experiment.

Claims

1. An environmental downhole equipment performance test method comprises the following steps: A. installing a rubber sleeve stress detection device at the position of a rubber sleeve of the packer; the packer is connected with a packer plug and a central pipe joint in a lower mode, the packer plug and the central pipe joint are connected into an experimental container in a lower mode, the upper end and the lower end of the experimental container are respectively connected with a container upper joint and a container lower joint, and a saline mixed liquid and CO are introduced into a container central pipe pressurizing hole₂The central pipe joint pipeline of the packer in the pressurizing system and the annular pressurizing hole at the lower part of the container are connected with the saline mixed liquid and CO₂The lower annular interface pipeline in the pressurizing system and the upper annular pressurizing hole of the container are connected with the saline water mixtureLiquid mixture and CO₂An upper annular interface pipeline in the pressurization system is used for connecting a circulating air inlet in the experimental container with a circulating air shackle through a pipeline, a circulating air outlet is connected with a circulating air inlet ball valve, a lower annular signal acquisition system is installed at a position corresponding to a container lower annular signal acquisition access hole, and an upper annular signal acquisition system is installed at a position corresponding to a container upper annular signal access hole; B. starting a low-pressure air-driven air system: starting an air compressor, pressurizing air and storing the air into an air storage tank, compressing the air in the air storage tank to 1MPa, then opening a control ball valve of a driving air communication system, and allowing low-pressure air to enter saline water mixed liquid and CO₂The low-pressure air interface pipeline of the pressurization system is a saline water mixed liquid and CO₂Each pneumatic control valve in the pressurized system provides drive air; C. starting a computer automatic control system, and remotely controlling the starting and stopping of various devices and the opening and closing of a pump valve by all collected signals in the integrated system through computer feedback control; D. starting an experimental process monitoring system: monitoring the operation of various devices and pipelines in the experimental process, and observing the emergency condition generated in the experimental engineering at the first time; E. maintaining brine mixture and CO₂Valve closure in pressurized systems: opening a saline mixed liquid output control ball valve, starting a saline mixed liquid pressure pump, opening a saline mixed liquid connection pneumatic control valve, enabling the saline mixed liquid to enter a saline mixed liquid mass flowmeter after being filtered by a saline mixed liquid filter, opening a packer central pipe pneumatic control valve, enabling the saline mixed liquid to enter a packer central pipe after passing through a packer central pipeline pressure gauge, controlling the saline mixed liquid pressure pump, setting a value of 2MPa as a step length, pressurizing to a pressure value of an experiment which is less than or equal to 45MPa, setting the packer, and testing the stress change of a rubber sleeve surface characteristic point in the process through a packer stress detection device; F. closing the packer central pipe pressurization pneumatic control valve: keeping the pressure of the central pipe of the packer constant, opening the lower annular pressurization pneumatic control valve, injecting the saline mixed liquid into the lower annular space in the container, controlling the saline mixed liquid pressurization pump, taking the set value of 2MPa as the step length, pressurizing, stopping pressurizing after the quality of the saline mixed liquid reaches the experimental amount, and closing the lower annular pressurization pneumatic valve to controlThe device and the saline water mixed liquid are connected with a pneumatic control valve; opening of CO₂Output control ball valve, start CO₂Special booster pump, start CO₂Connecting the pneumatic control valve, CO₂By CO₂After the filter enters CO₂Mass flowmeter, open the lower annular pressure pneumatic valve control device, control CO₂A special pressurizing pump, wherein the set value of 2MPa is the step length, and the pressure is 1MPa lower than the pressure value required by the experiment; closed lower annulus pressurized pneumatic valve control device, CO₂Connecting pneumatic control valve and starting CO₂Metering pump, opening CO₂Pneumatic control valve for communicating pipe of metering pump to control CO₂Pressurizing the pipeline to the pressure value of less than or equal to 45MPa by the metering pump, then opening the lower annular pressurizing pneumatic valve control device to control CO₂Pressurizing the lower annular space of the packer to the experimental pressure value by the metering pump, keeping the pressure constant for 5-10min, and acquiring the stress change and data of the surface characteristic point of the packing element by the signal acquisition system in the process; after completion, the lower annular space is closed, the pneumatic valve control device and CO are pressurized₂The metering pump is communicated with the pneumatic control valve of the pipeline, the lower annular pressure relief pneumatic control valve is opened, the lower annular pressure is relieved, the experimental waste liquid enters the waste liquid recovery tank, and the lower annular pressure relief pneumatic control valve is closed after pressure relief is finished; G. keeping the pressure of the central pipe of the packer constant: opening a saline mixed liquid output control ball valve, starting a saline mixed liquid pressure pump, opening the saline mixed liquid connection pneumatic control valve and an upper annular pressurization pneumatic control valve, injecting the saline mixed liquid into an upper annular space of a container, controlling the saline mixed liquid pressure pump, taking a set value of 2MPa as a step length, pressurizing, stopping pressurizing after the quality of the saline mixed liquid reaches the experimental amount, and closing the upper annular pressurization pneumatic control valve and the saline mixed liquid connection pneumatic control valve; opening of CO₂Output control ball valve, start CO₂Special booster pump, turning on CO₂Connecting the pneumatic control valve, CO₂By CO₂After the filter enters CO₂Mass flow meter, open the upper annular pressurized pneumatic control valve, control CO₂A special pressurizing pump, wherein the set value of 2MPa is the step length, and the pressure is 1MPa lower than the pressure value of the experiment; closing upper annulus pressurization pneumatic control valve, CO₂Is connected toPneumatic control valve, start CO₂Metering pump, opening CO₂Pneumatic control valve for communicating pipe of metering pump to control CO₂Pressurizing the pipeline to a pressure value 1MPa lower than that of the experiment by a metering pump, then opening an upper annular pressurization pneumatic control valve, and controlling CO₂Pressurizing the upper annular space by the metering pump until the pressure value of the experiment is less than or equal to 45MPa, keeping the pressure constant for 5-10min, and testing the stress data and the data change of the surface characteristic point of the rubber sleeve in the process by the signal acquisition system through the packer stress detection device; after the completion, closing the upper annular pressurization pneumatic control valve and CO₂The metering pump is communicated with the pneumatic control valve through a pipeline, the upper annulus pressure relief pneumatic control valve is opened, the upper annulus pressure is relieved, the experimental waste liquid enters the waste liquid recovery tank, and the upper annulus pressure relief pneumatic control valve is closed after pressure relief is finished; H. keeping the pressure of the central pipe of the packer constant: opening a salt water mixed liquid output control ball valve, starting a salt water mixed liquid pressure pump, opening a salt water mixed liquid linkage pneumatic control valve, opening a lower annulus pressurization pneumatic control valve, injecting the salt water mixed liquid into the lower annulus space in the container, controlling the salt water mixed liquid pressure pump, taking the set value of 2MPa as the step length, pressurizing, stopping pressurizing after the salt water mixed liquid is measured to a certain mass which is less than or equal to 45MPa, and closing a lower annulus pressurization pneumatic valve control device; then opening an upper annular pressurization air control valve, injecting the saline mixed liquor into the upper annular space of the container, controlling a saline mixed liquor pressurization pump, taking the set value of 2MPa as the step length, pressurizing, stopping pressurizing after the quality of the saline mixed liquor reaches the experimental amount, and closing the upper annular pressurization air control valve and the saline mixed liquor linkage air control valve; opening of CO₂Output control ball valve, start CO₂Special booster pump, turning on CO₂Connecting the pneumatic control valve, CO₂By CO₂After the filter enters CO₂Opening the lower annular pressurization pneumatic control valve and the upper annular pressurization pneumatic control valve to control CO by the mass flow meter₂A special pressurizing pump, wherein the set value of 2MPa is the step length, and the pressure is 1MPa lower than the pressure value of the experiment; closing lower annulus pressurization pneumatic control valve and upper annulus pressurization pneumatic control valve, CO₂Connecting a pneumatic control valve; start-up of CO₂Metering pump, opening CO₂Metering pump communicating pipelinePneumatic control valve for controlling CO₂Pressurizing the pipeline to a pressure value 1MPa lower than that of the experiment by a metering pump, and then opening a lower annular pressurization air control valve and an upper annular pressurization air control valve to control CO₂Pressurizing the upper annular space to the experimental pressure value by the metering pump; starting a container heating device and a circulating air compressor, keeping a low-pressure exhaust ball valve and a low-pressure air inlet ball valve closed, opening a circulating inlet ball valve, and controlling the container heating device to heat the container to the experimental temperature value of 120 ℃; keeping the pressure in the container constant in the heating process; after heating is finished, keeping the pressure, the temperature and the PH value in the container constant for 7-9 hours, and testing the stress data of the surface characteristic points of the rubber sleeve once every 5min by the signal acquisition system through a packer stress detection device; J. keeping the pressure of the central pipe of the packer constant: closing the container heating device, opening a low-pressure exhaust ball valve and a low-pressure air inlet ball valve, and cooling the container by circulating air through a circulating air compressor to room temperature; after the temperature in the container is reduced to room temperature, opening the upper annular pressure relief air control valve device and the lower annular pressure relief air control valve, and unloading the upper annular pressure and the lower annular pressure to be the same at atmospheric pressure; opening the pressure relief pneumatic control valve of the central pipe of the packer and removing the pressure of the central pipe; in the pressure relief process, a signal acquisition system is used for testing the stress data of the characteristic points on the surface of the rubber sleeve in the process for one time through a packer stress detection device for 0.5min until the pressure relief is finished; the experimental waste liquid enters a waste liquid recovery box; K. and (5) pulling out the packer, and connecting all pipelines with clean water to flush all pump valve parts.

2. The downhole equipment performance testing device adopting the downhole equipment performance testing method according to claim 1, wherein the downhole equipment performance testing device is prepared by mixing a saline water mixed solution and CO₂Pressurization system (1), experiment container system (2), circulation heating system (3), low pressure drive air system (4), computer automatic control system (5), experiment process monitoring system constitute its characterized in that: in a brine mixture and CO₂Packer central pipe pressurization pneumatic control valve devices (1-7) and lower annular pressurization pneumatic control valve devices (1-14) in the pressurization system (1) are respectively connected with experimental container devices (2-3) in the experimental container system (2) and are mixed with salt waterAnd CO₂A packer central pipe pressure relief air control valve device (1-27) in the pressurization system (1) is connected with a ball valve 4-6 in the low-pressure driving air system (4), and an experiment container device (2-3) in the experiment container system (2) is respectively connected with a circulating air inlet ball valve (3-4) and a circulating air compressor (3-1) in the circulating heating system (3).

3. The downhole equipment performance testing apparatus of claim 2, wherein: the brine mixed solution and CO₂The pressure system (1) consists of CO₂Gas cylinder, CO₂Output control ball valve, CO₂Special booster pump, CO₂Filter, CO₂Linkage pneumatic control valve, CO₂The device comprises a mass flow meter, a packer central pipe pressurization pneumatic control valve, a brine mixed liquid medium box, a brine mixed liquid output control ball valve, a brine mixed liquid pressurization pump, a brine mixed liquid filter, a brine mixed liquid linkage pneumatic control valve, a brine mixed liquid mass flow meter, a lower annulus pressurization pneumatic control valve, a lower annulus pipeline pressure gauge, a lower annulus pipeline safety valve, a brine mixed liquid metering pump, a CO central pipe pressurization pneumatic control valve, a packer central pipe pressurization pneumatic control valve, a brine mixed liquid medium₂Metering pump communicating pipe pneumatic control valve and CO₂Metering pump, CO₂The system comprises a metering pump communicating pipe pneumatic control valve, an upper annulus pressurization pneumatic control valve, an upper annulus pressure gauge, an upper annulus safety valve, an upper annulus pressurization pneumatic control valve, a lower annulus pressurization pneumatic control valve, a packer central pipe pressure gauge, a packer central pipe pressurization pneumatic control valve, a waste liquid recycling tank and a waste liquid recycling tank emptying control ball valve, wherein a low-pressure driving air interface is connected with a driving system interface in a low-pressure driving air system (4), an upper annulus interface is connected with an experiment container device (2-3) and an upper annulus pressurization hole, a lower annulus interface is connected with a lower annulus pressurization hole of the experiment container device (2-3), a packer central pipe interface is connected with a central pipe pressurization hole of the experiment container device (2-3), and CO is connected with a central pipe pressurization hole of the₂The gas storage cylinder (1-1) is connected with CO₂An output control ball valve (1-2) is connected with CO₂A special booster pump (1-3) which is then connected with CO in sequence₂Filter (1-4), CO₂A linkage pneumatic control valve device (1-5), CO₂The mass flow meter (1-6), the packer central pipe pressurization pneumatic control valve (1-7), the packer central pipeline pressure gauge (1-26), connect to the central pipe interface of the packer finally; the brine mixed liquid medium tank (1-8) is connected with a brine mixed liquid output control ball valve (1-9), then is connected with a brine mixed liquid booster pump (1-10), then is sequentially connected with a brine mixed liquid filter (1-11), a brine mixed liquid linkage pneumatic control valve (1-12), a brine mixed liquid mass flowmeter (1-13), a lower annulus pneumatic control valve (1-14), a lower annulus pipeline pressure gauge (1-15) and a lower annulus pipeline safety valve (1-16), and finally is connected to a lower annulus interface; the saline mixed liquid metering pump (1-17) is connected with CO₂A metering pump communicating pipeline pneumatic control valve (1-18) is connected into a pipeline saline mixed liquid booster pump (1-10) and then connected between a saline mixed liquid filter (1-11); CO2₂Metering pump (1-19), CO₂The metering pump communicating pipeline pneumatic control valve device (1-20) is sequentially connected with an upper annulus pressurization pneumatic control valve (1-21), an upper annulus pipeline pressure gauge (1-22) and an upper annulus pipeline safety valve (1-23), and is finally connected with an upper annulus interface; introducing CO₂The mass flow meters (1-6), the saline mixed liquid mass flow meters (1-13) and the lower annular pressurized air control valves (1-14) between the packer central pipe pressurized air control valves (1-7) and the CO₂The metering pump communicating pipeline pneumatic control valves (1-20) and the upper annular pressurization pneumatic control valves (1-21) are connected through pipelines; another pipeline is communicated between the upper annular pressurization air control valve (1-21) and the upper annular pipeline pressure gauge (1-22), then the upper annular pressurization air control valve (1-24) is connected, and finally the pipeline is output to the waste liquid recovery tank (1-28); the lower annulus pressurization pneumatic control valve (1-14) and the lower annulus pipeline pressure gauge (1-15) are communicated with another pipeline and then connected into the lower annulus pressure relief pneumatic control valve (1-25), and finally the pipeline is output to the waste liquid recovery tank (1-28); another pipeline is communicated between the pressurized pneumatic control valve (1-7) of the central pipe of the packer and the pressure gauge (1-26) of the central pipeline of the packer, and then the pressurized pneumatic control valve (1-27) of the central pipe of the packer is connected, and finally the pipeline is output to the waste liquid recovery tank (1-28); the waste liquid recovery box (1-28) is connected with a waste liquid recovery box emptying control ball valve (1-29).

4. The downhole equipment performance testing apparatus of claim 2, wherein: the experimental container device (2) is composed of an upper annular signal acquisition system (2-1), an upper annular sampling system (2-2), an experimental container device (2-3), a lower annular signal acquisition system (2-4), a lower annular sampling system (2-5), a container lower joint (2-3-1), a lower annular pressurizing hole (2-3-2), a circulating air inlet (2-3-3), a container heat-insulating layer (2-3-4), a container heating device (2-3-5), a container device (2-3-6), a center pipe joint (2-3-7), a container upper joint (2-3-8), a center pipe pressurizing hole (2-3-9), an upper annular pressurizing hole (2-3-10), An upper annular signal access hole (2-3-11), a circulating air outlet (2-3-12), a packer device (2-3-13), a rubber cylinder (2-3-14), a rubber cylinder stress detection device (2-3-15), a packer plug (2-3-16) and a lower annular signal access hole (2-3-17), containers (2-3-6) in the experimental containers (2-3) are respectively connected with a container lower joint (2-3-1), an upper container upper joint (2-3-8), a central pipe joint (2-3-7) and a packer (2-3-13), and the packer (2-3-13) is connected with a packer plug (2-3-16); the outer layer of the container (2-3-6) is respectively connected with the container heating layer (2-3-5) and the container heat-insulating layer (2-3-4); the lower annular pressurizing hole (2-3-2) is connected with the salt water mixed liquid and CO₂The lower annular interface and the upper annular pressurizing hole (2-3-10) in the pressurizing system (1) are connected with the salt water mixed liquid and CO₂The upper annular interface in the pressurizing system (1) and the central pipe pressurizing hole (2-3-9) are connected with the saline mixed liquid and CO₂A packer centre tube interface in a pressurization system (1); an upper annular signal acquisition access hole (2-3-11) is connected with an upper annular signal acquisition system (2-1) through an interface; the interface of the lower annular signal acquisition access hole (2-3-17) is accessed into the lower annular signal acquisition system (2-4); the circulating air inlet (2-3-3) and the circulating air outlet (2-3-12) are respectively connected with a circulating air compressor (3-1) and a circulating air inlet ball valve (3-4).

5. The downhole equipment performance testing apparatus of claim 2, wherein: the circulating heating system (3) is composed of a circulating air compressor (3-1), a low-pressure air inlet valve (3-2), a low-pressure exhaust valve (3-3) and a circulating air inlet ball valve (3-4), wherein the low-pressure air inlet valve (3-2) is connected with the circulating air inlet ball valve (3-4), and the circulating air compressor (3-1) is connected with the low-pressure exhaust ball valve (3-3), the low-pressure air inlet ball valve (3-2) and the circulating air inlet ball valve (3-4) respectively and then is connected with a circulating air inlet (2-3-3) and a circulating air outlet (2-3-12) in the experimental container device (2-3).

6. The downhole equipment performance testing apparatus of claim 2, wherein: the low-pressure driving air system (4) is composed of an air compressor (4-1), an air storage tank (4-2), a safety valve (4-3), an air filter (4-4), a pressure gauge (4-5) and a ball valve (4-6), wherein the air compressor (4-1) is sequentially connected with the air storage tank (4-2), the safety valve (4-3), the air filter (4-4), the pressure gauge (4-5) and the ball valve (4-6).